The life and times of the royal children

Princess Charlotte waves while holding her mother Catherine, the Duchess of Cambridge's hand after attending the wedding ceremony of Prince Harry and Meghan Markle at Windsor Castle, in Windsor, May 19, 2018.

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Princess Charlotte waves while holding her mother Catherine, the Duchess of Cambridge's hand after attending the wedding ceremony of Prince Harry and Meghan Markle at Windsor Castle, in Windsor, May 19, 2018.

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Britain's Prince George leaves after the wedding of Prince Harry and Meghan Markle at St. George's Chapel in Windsor Castle in Windsor, May 19, 2018.

AP

Catherine, the Duchess of Cambridge arrives with the bridesmaids at St George's Chapel at Windsor Castle for the wedding of Prince Harry and Meghan Markle in Windsor, May 19, 2018.

Reuters

Duchess of Cambridge shows her daughter Princess Charlotte kissing her newborn brother Prince Louis on her third birthday in London, May 2, 2018.

HRH The Duchess of Cambridge/EPA via Shutterstock

Prince Louis three days after he was born at Kensington Palace on April 26, 2018, in London.

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Princess Charlotte of Cambridge turns to wave at the media as she goes with her brother Prince George and their father, Prince William, at the Lindo Wing of St Mary's Hospital to meet their newborn brother in central London, April 23, 2018.

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Catherine, Duchess of Cambridge, holds her newborn son as she and her husband, Prince William, Duke of Cambridge, show him to the media outside the Lindo Wing at St Mary's Hospital, April 23, 2018, in London.
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Louis Arthur Charles, the third child of William and Kate, weighed 8 pounds, 7 ounces at birth. He was born at 11:01 a.m., local time.
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Prince Louis is fifth in line for the throne.

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Princess Charlotte stands on the steps at Kensington Palace shortly before she left for her first day at the Willcocks Nursery School, Jan. 8, 2018.

Kesington Palace

Two-year-old Princess Charlotte arrives with her royal family at the Tegel Airport in Berlin, July 19, 2017. <br><br> The royal family traveled on a five-day tour of Poland and Germany.

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Princess Charlotte to mark her second birthday on May 2, 2017.

KensingtonRoyal/Twitter

Princess Charlotte smiles, at Anmer Hall, in Norfolk, England. The princess will celebrate her first birthday on May 2, 2016.

HRH The Duchess of Cambridge

Princess Charlotte, right, being held by her brother 2-year-old Prince George at Anmer Hall, eastern England in mid-May 2015.

HRH The Duchess of Cambridge via @ Kensington Royal

Catherine, Duchess of Cambridge, and Prince William, Duke of Cambridge, depart the Lindo Wing with their newborn daughter at St Mary's Hospital on May 2, 2015, in London.
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Their newborn daughter's name is Charlotte Elizabeth Diana. The second child of William and Kate weighed 8 pounds, 3 ounces at birth. She was born at 8:34 a.m., local time. <br><br>
Charlotte is fourth in line to the throne.

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Prince George, who celebrates his third birthday on July 22, 2016, sits on a picnic blanket while offering an ice cream to the family dog, Lupo, at the family's Norfolk home.

Duke and Duchess of Cambridge/Matt Porteous

Prince George will celebrate his third birthday on July 22, 2016.

Duke and Duchess of Cambridge/Matt Porteous

Two-year-old Prince George heads to his first day of nursery school, Jan. 6, 2016.

Kensington Palace/Twitter

Prince George gives a thumbs-up as he attends the Royal International Air Tattoo at RAF Fairford, July 8, 2016, in Fairford, England.

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Prince George sits for his official Christmas picture in a courtyard at Kensington Palace in late November 2014 in London.

Prince George plays during a visit to Plunket nurse and parents group at Government House in Wellington, New Zealand, April 9, 2014.

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Prince William, Duke of Cambridge, holds his son, Prince George of Cambridge, as he arrives at Chapel Royal in St James's Palace in central London for George's christening, Oct. 23, 2013.

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Catherine, the Duchess of Cambridge, carries her newborn son Prince George outside St. Mary's Hospital, in London, July 23, 2013.
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Their newborn son's full name is George Alexander Louis. He weighed 8 pounds, 6 ounces at birth and was born at 4:24 p.m., local time.
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George is third in line to the throne.